"Schwarzwert" does not mean how much your black is worth, rofl. It means what luminescence the darkest color (black) still has. It defines how dark the display can go. The opposite is "Weißwert", so how bright the display can go (white). The difference between these two is your contrast ratio. The lower the Schwarzwert the better, the higher the Weißwert the better.

Was the writing on the box in English? Not trying to make life difficult for you, but Samsung product sold by an authorized dealer in Australia shouldn't be set to German out of the box. If you bought this monitor from a small "mom and pop" store, they might not have sold you a product designed to be sold in your country. Small "mom and pop" stores are occasionally not authorized dealers and have to resort to buying "gray market" product so they have something to sell. "Gray market" product is stuff that the manufacturer didn't intend to have sold in that market and they respond to that type of behavior by not honoring the warranty if you have a problem. Just want to make sure you didn't buy something that doesn't have a warranty, unless you knew that was the case when you bought it. Again, don't know for sure that is what happened, but puzzling that Australia product defaulting to German.